| Brewery | Location |
|---|---|
| Other Half Brewing Co. & Suarez Family Brewery | |
| Ottakringer Brauerei AG | Wien, Austria |
| Otter Creek & Jack's Abby | |
| Otter Creek & Lawson's Finest Liquids | |
| Otter Creek Brewing | Middlebury, Vermont |
| Otter Creek Brewing & Wolaver's Organic Ales | Middlebury, Vermont |
| Otto's Pub and Brewery | State College, Pennsylvania |
| Oud Beersel Brewery | Belgium |
| Our Mutual Friend | |
| Out of Bounds Brewing Company | Rocklin |
| Out.Haus Ales | Northwood |
| Outer Banks | |
| Overshores Brewing Co. | |
| OWA Beer | Brussels, Belgium |
| OWA Brewery | Belgium |